Gold Mining - Kinds of Placer Deposits

Kinds of Placer Deposits A placer deposit or placer is a deposit that formed in moving water where particles/pieces of gold and/or other dense minerals have accumulated because the water flow isn't sufficient to keep them moving.. In many cases, for a placer deposit to accumulate gold over time, the water must be moving fast enough to flush out lighter sand.

Topic 7-mining methods-part iii -surface mining- placer mining

Feb 01, 2016· Topic 7-mining methods-part iii -surface mining- placer mining 1. Topic 7: Mining Methods Part III: Surface mining- Placer Mining Hassan Z. Harraz [email protected] 2015- 2016 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.

Nome Offshore Placer deposits (ARDF #NM253) Au

Gold occurs in offshore placer deposits off the coast of Nome, particularly from a point west of the mouth of the Nome River to near Penny River. From about 1960 to 1991, and especially from 1987 to 1990, there has been significant exploration and gold production. From mean lower low tide, the auriferous deposits extend seaward for about 2 miles.

Gold, Platinum and Diamond placer deposits in alluvial ...

Special Report 89 Gold, Platinum and Diamond Placer Deposits in Alluvial Gravels, Whitecourt, Alberta G.G. Mudaliar1, J.P. Richards1 and D.R Eccles2 1 Department of Earth & Atmospheric Sciences, University of Alberta 2 Alberta Geological Survey May 2007

Exploration and Evaluation Methods to find ... - Rio Suerte

One of the most difficult task associated with placer mining is the evaluation of the deposit. More placer projects have failed due to inaccurate assessment of reserves than any other reason. Within the realm of alluvial deposits, those containing valuable minerals with a high value unit (diamonds) are more difficult to prove than those with a ...

Introduction to Paleoplacer Deposits - Michael W. Meissner

In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush.

alluvial | West Coast Placer

The third type of alluvial placer deposit is a bench placer. Bench deposits are part of the old stream bed before it cut into a deeper channel. Benches can contain huge amounts of gold if the river carried gold at that time. A bench is typically flat on top and may appear like steps coming down the valley side.

Walsh Cut (alluvial placer) (ARDF #NM215) Au

This gold-bearing alluvial fan is at the mouth of Walsh Cut (NM214), south of Sophie Gulch (NM208). The fan is as much as 500 feet long and as much as 300 feet across. Most of the fan is covered with vegetation typical of adjacent hill slopes, but the lower, sparsely vegetated fan resulted from placer mining operations at Walsh Cut (NM214).

How to Identify Platinum in Ore Deposits | Sciencing

Gravel deposits in Alberta, Canada, provide a placer source for platinum in certain rivers, where it coincides with gold and other minerals. Platinum flakes can be recovered through gravel washings, shaking tables and other methods. Generally, platinum grains require microscopy for identification from alluvial deposits.

Big Sky Country Sapphire: Visiting Montana's Alluvial Deposits

Big Sky Country Sapphire: Visiting Montana's Alluvial Deposits. Tao Hsu, Andrew Lucas, Robert E. Kane, Shane McClure, and Nathan Renfro Download PDF. Figure 1. Sapphire deposits are clustered in southwestern Montana. ... While Yogo Gulch is a primary deposit, the placer deposits at Rock Creek, Dry Cottonwood Creek, and the upper Missouri ...

What Is Alluvium? - WorldAtlas

Aug 28, 2017· Placer Deposits. In addition to the previously mentioned nutrients, alluvium deposits may also consist of valuable minerals and ore. When gold, platinum, or other precious metals and stones are found in alluvium, it is referred to as placer deposits.

Alluvial deposit - definition of alluvial deposit by The ...

Define alluvial deposit. alluvial deposit synonyms, alluvial deposit pronunciation, alluvial deposit translation, English dictionary definition of alluvial deposit. ... placer - an alluvial deposit that contains particles of some valuable mineral. ... alluvial deposit; Alluvial deposits; Alluvial deposits; Alluvial deposits; alluvial fan ...

Descriptive Model of Placer Au-PGE - USGS

DESCRIPTIVE MODEL OF PLACER Au-PGE Model 39a By Warren E. Yeend DESCRIPTION Elemental gold and platinum-group alloys in grains and (rarely) nuggets in gravel) sand, silt, and clay, and their consolidated equivalents, in alluvial, beach, eolian, and (rarely) glacial deposits (see fig. 195). GENERAL REFERENCES Boyle (1979), Wells (1973), Lindgren ...

Method of placer gold deposits exploration?

Method of placer gold deposits exploration? ... but you should know that it is required to collect the deepest layers of the alluvial deposits, which generally host heavy minerals and gold ...

Placer Deposits - SOEST

• Placer Deposit Types • Environments of Placer Mineral Occurrence ... placer deposits? Consumption of mineral aggregates by the US construction industry, for the periods 1959 and 1972 (in millions of tons) ... Alluvial Diamond Mining, Africa Open-Pit Iron Ore Mining, Placer Mining on Land Brazil.

Alluvial Gold Explained - To Help You Find Gold

Just What is Primary, Alluvial Gold and Eluvial gold. Primary gold is Reef or Lode gold where the gold is still deposited in its original host rock. There are a few theories on how gold originated but the main consensus is that the majority of gold nuggets originate from Primary gold deposits. Alluvial Gold (Deposited by water movement) and.

Eluvial and Alluvial Placers and Gold-Quartz Vein

Sketch illustrating outcrop of a gold-quartz vein supplying material to form eluvial and alluvial placers. By one terminology, an eluvial placer embraces all materials not transported by streams. By another, only the placer materials over weathered and disintegrated deposits constitute an eluvial placer; downslope and other placer materials are classified as deluvial and proluvial as shown.

Portable mining wash plant, mobile mining washing plant ...

11 models, for alluvial (placer) and hard rock (primary) deposits, capacity range 25 to 170 tons/hour SIMULTANEOUS PROCESSING SUPERMINER ® Plants are designed for automatic and simultaneous processing and recovery of gold and diamonds together.

Secondary gold mineralization in the Amani Placer Gold ...

Secondary gold mineralization in the Amani Placer Gold Deposit, Tanzania. ... The alluvial gold deposit is situated between latitude 10° 0′ S to 10° 2′ S and longitude 34° 57′ E to 34° 58′ E. The area has a hot tropical climate with the rainy season occurring between November and May with an annual rainfall of 1140 mm.

PLACER DEPOSITS Sub-committee Members

guidelines for the evaluation and reporting of MRMR for placer deposits. Placer deposits include several different types of commodities and a range of geological environments. The three deposit types discussed here; mineral sands, placer gold and alluvial diamonds, are considered to have specific technical issues that require specialized knowledge.


Placer mining is the mining of stream bed (alluvial) deposits of economic m inerals. This may be This may be done by open-pit (also called open-cast mining ) or by various surface excavating ...

Placer mining - Wikipedia

Aug 05, 2013· Alluvial is the name for placer deposits formed by water action in a stream or river. For most people, it's all about alluvial deposits, or to be blunt, the allure of gold, with the odd precious and semi-precious gem thrown into the mix.

Module 1 – What Placer Deposits Are and How they Form

In these situations they may merge with alluvial placer deposits downslope and with residual placer deposits upslope. As in residual placer deposits, the heavy minerals in eluvial deposits commonly retain some of their original physical character. Alluvial placer deposits are those that form in stream sediments (alluvium). Stream currents will ...

Alluvial Placers - Prospector's Paradise

An alluvial deposit is an ancient river-washed rock and gravel bar that may be thousands of feet from the nearest stream, creek, or river. Alluvial (or bench) deposits contain untapped potential for finding gold because such areas have never been worked before.

Placer deposit | geology | Britannica

Latitude and longitude can be used to describe any location on Earth. There are several varieties of placer deposits: stream, or alluvial, placers; eluvial placers; beach placers; and eolian placers. Stream placers, by far the most important, have yielded the most placer gold, cassiterite, platinum ...

Eluvial placer | mining | Britannica

Other articles where Eluvial placer is discussed: placer deposit: Eluvial placers form on hillslopes from weathered deposits. They are not acted on by streams but by rainfall and wind, which carry away the light materials; thus they may be considered intermediate in the formation of stream placers. Examples include the earlier worked gold deposits…

Prospecting Placer Gold Deposits

Placer mining is the mining and treatment of alluvial deposits for the recovery, of their valuable minerals. The method has been used principally for mining gold, but a large proportion of the world's production of tin, platinum, and diamonds and other gem stones and minor quantities of other heavy minerals have been won in this manner.

Placer formation - LinkedIn SlideShare

Apr 02, 2013· Eluvial gold deposits are mined in Australia, New Zealand, USA, South America etc.• In India wolframite and kyanite are mined as eluvial deposits. 23. Fig 1.5 Famous Australian gold nuggets (Eluvial gold deposite) 24. Stream or Alluvial placer Formation• Stream placers are by far the most important type of placer deposits.